<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model.trim="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.trim="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="selected">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="addOrEdit">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0" v-show="list.length">
        <tr >
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in list" :key="item.id">
          <td>{{item.id}}</td>
          <td>{{item.name}}</td>
          <td>{{item.age}}</td>
          <td>{{item.gender}}</td>
          <td>
            <button @click="del(item.id)">删除</button>
            <button @click="edit(item.id)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
  <script src="./vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        name: '',
        age: '',
        selected: '男',
        curId: "",
        isEdit: false,
        list: []
      },
      methods: {
        del(id) {
          this.list = this.list.filter((item) => item.id !== id);
        },
        addOrEdit() {
          if (!this.name || !this.age) return alert('输入正确的姓名和年龄')
          if (this.isEdit) {
            const index = this.list.findIndex(item => item.id === this.curId)
            if (index !== -1) {
              this.list[index] = {
                id: this.curId,
                name: this.name,
                age: this.age,
                gender: this.selected
              }
              this.isEdit = false
            }
          }
          else {
            this.list.push({
              id: this.list.length + 1,
              name: this.name,
              age: this.age,
              gender: this.selected
            })
          }

          this.name = ''
          this.age = ''
          this.selected = '男'
        },
        edit(id) {
          const item = this.list.find(item => item.id === id);
          if (item) {
            this.name = item.name;
            this.age = item.age;
            this.selected = item.gender;
            this.curId = id;
            this.isEdit = true;
          }
        }
      }
    })
  </script>
</body>

</html>